Hi Andrew. I’ve enjoyed your blog for a while. Now I’m looking for a home to buy and find myself wondering if YOU would buy (or even rent) in Sheffield Village? It’s one of the areas our budget has led us to, but it scares me. And then I wonder if living ON the fault is so much worse than living, say, across the freeway from the fault.
Lesley, I’m not a practicing geologist and it would be illegal for me to advise you. I can only tell you that I live less than 2 kilometers from the fault, love where I am, and am not a homeowner. I can also tell you that I adore Sheffield Village. Every homesite has its own unique geologic setting, even within a single development.
When the big one hits Oakland, we will all be in the same place.
The City of Fremont will show you around its segment of the Hayward fault in 90-minute walks on three Saturdays this summer. The first walk is next week. See more here.
While I’m at it, I will be leading a two-hour walk for the Oakland Heritage Alliance on August 18 around the landscape (and rock specimens) of Middle Harbor Park. And on September 8 I’ll lead a walk around the Hayward fault and other attractions of Montclair for Oakland Urban Paths. Mark your calendars now.
[The concentric brown bands inside massive sandstone are common in coastal California. I understand that they mark the passage of petroleum from source beds below on their way toward the surface or an underground trap. They are spectacularly exposed along the Santa Cruz beach cliffs among other places. --Andrew]
Next week—Saturday the 18th—I’ll be leading a walk for the Oakland Heritage Alliance down at Middle Harbor Park, 10 am to noon. The topic is the wonderful recycled landscape there, regarded as both an artistic and geotechnical achievement.
Hi, my apologies if I ever asked this before, my memory is bad.
I found this fossil in the railroad cut in Fernandez Park in Pinole. I realize that that is not Oakland, but thought you might know of the age of the rock there.
I thought it was a samarra (maple tree “helicopter”) mainly because it has a “bump” without veins where the seed would be, but a friend’s friend who works at UC Berkeley in Paleontology (I think) thought that sounded misplaced. Maybe it’s a shell. Dunno the age.
The original was sadly destroyed (so crumbly), and a planned field trip with him to the locality to search for others never materialized.
Michael, the contact is mapped as a thrust fault, with the Cretaceous rocks pushed over the younger ones. Moreover, the Cretaceous rocks are of Campanian age while the Tertiary rocks are Miocene, so there’s an age gap of about 50 million years there.
The nearest true K-T (Maastrichtian–Danian) contact I know of is down in the Panoche Hills.
I was reading about the Science Night at Claremont Middle School, which happened Thursday night (17 Jan). The Trib said, and Rockridge Patch confirms, that one of the events was an “Earth Science Dinner.” Can anyone tell me what was served?